Top 5 Radon Hotspots in the Boston Metro Area
Cities with the highest average user-submitted radon readings in the Boston Metro metropolitan area.
| Rank | City | Avg. Radon Level | Tests |
|---|---|---|---|
| 1 | Littleton |
9.40 pCi/L
|
5 |
| 2 | Gloucester |
8.40 pCi/L
|
5 |
| 3 | Chelmsford |
11.50 pCi/L
|
4 |
| 4 | Somerville |
4.50 pCi/L
|
4 |
| 5 | Danvers |
3.80 pCi/L
|
4 |
Other Metro Areas in Massachusetts
Explore radon data for other metropolitan regions across the state.
Cities in the Boston Metro Area
89 cities and towns in the Boston Metro metropolitan area with user-submitted radon data.
89 cities
Acton
Zone 1
20.0
pCi/L
Above EPA action level
Norwell
Zone 1
20.0
pCi/L
Above EPA action level
Woburn
Zone 1
16.3
pCi/L
Above EPA action level
Weymouth
Zone 1
15.0
pCi/L
Above EPA action level
Marlborough
Zone 1
13.5
pCi/L
Above EPA action level
North Reading
Zone 1
13.5
pCi/L
Above EPA action level
Dracut
Zone 1
13.0
pCi/L
Above EPA action level
Westford
Zone 1
12.7
pCi/L
Above EPA action level
North Andover
Zone 1
11.7
pCi/L
Above EPA action level
Chelmsford
Zone 1
11.5
pCi/L
Above EPA action level
Cohasset
Zone 1
11.5
pCi/L
Above EPA action level
Wayland
Zone 1
10.7
pCi/L
Above EPA action level
Quincy
Zone 1
10.5
pCi/L
Above EPA action level
Newburyport
Zone 1
10.3
pCi/L
Above EPA action level
North Weymouth
Zone 1
10.0
pCi/L
Above EPA action level
Andover
Zone 1
10.0
pCi/L
Above EPA action level
Stoneham
Zone 1
9.7
pCi/L
Above EPA action level
Littleton
Zone 1
9.4
pCi/L
Above EPA action level
Hopkinton
Zone 1
9.3
pCi/L
Above EPA action level
Franklin
Zone 1
9.0
pCi/L
Above EPA action level
Braintree
Zone 1
9.0
pCi/L
Above EPA action level
Wellesley Hills
Zone 1
8.5
pCi/L
Above EPA action level
Gloucester
Zone 1
8.4
pCi/L
Above EPA action level
Medford
Zone 1
8.0
pCi/L
Above EPA action level
Rowley
Zone 1
8.0
pCi/L
Above EPA action level
Pepperell
Zone 1
7.0
pCi/L
Above EPA action level
Topsfield
Zone 1
7.0
pCi/L
Above EPA action level
Hingham
Zone 1
7.0
pCi/L
Above EPA action level
Beverly
Zone 1
7.0
pCi/L
Above EPA action level
Buzzards Bay
Zone 1
7.0
pCi/L
Above EPA action level
Georgetown
Zone 1
7.0
pCi/L
Above EPA action level
Milton
Zone 1
7.0
pCi/L
Above EPA action level
Plymouth
Zone 1
7.0
pCi/L
Above EPA action level
Stow
Zone 1
7.0
pCi/L
Above EPA action level
Boxford
Zone 1
6.7
pCi/L
Above EPA action level
Framingham
Zone 1
6.5
pCi/L
Above EPA action level
North Billerica
Zone 1
6.5
pCi/L
Above EPA action level
Amesbury
Zone 1
6.0
pCi/L
Above EPA action level
Foxboro
Zone 1
6.0
pCi/L
Above EPA action level
Hanson
Zone 1
6.0
pCi/L
Above EPA action level
Methuen
Zone 1
6.0
pCi/L
Above EPA action level
Needham
Zone 1
6.0
pCi/L
Above EPA action level
Roslindale
Zone 1
6.0
pCi/L
Above EPA action level
Reading
Zone 1
5.7
pCi/L
Above EPA action level
Burlington
Zone 1
5.5
pCi/L
Above EPA action level
Merrimac
Zone 1
5.5
pCi/L
Above EPA action level
Middleton
Zone 1
5.5
pCi/L
Above EPA action level
Sudbury
Zone 1
5.5
pCi/L
Above EPA action level
Ashland
Zone 1
5.3
pCi/L
Above EPA action level
Melrose
Zone 1
5.0
pCi/L
Above EPA action level
Haverhill
Zone 1
5.0
pCi/L
Above EPA action level
Malden
Zone 1
5.0
pCi/L
Above EPA action level
Wilmington
Zone 1
5.0
pCi/L
Above EPA action level
Groton
Zone 1
5.0
pCi/L
Above EPA action level
Norwood
Zone 1
5.0
pCi/L
Above EPA action level
Peabody
Zone 1
5.0
pCi/L
Above EPA action level
Pembroke
Zone 1
5.0
pCi/L
Above EPA action level
Saugus
Zone 1
5.0
pCi/L
Above EPA action level
Stoughton
Zone 1
5.0
pCi/L
Above EPA action level
Westwood
Zone 1
5.0
pCi/L
Above EPA action level
Somerville
Zone 1
4.5
pCi/L
Above EPA action level
East Weymouth
Zone 1
4.5
pCi/L
Above EPA action level
Everett
Zone 1
4.5
pCi/L
Above EPA action level
Lynnfield
Zone 1
4.5
pCi/L
Above EPA action level
Natick
Zone 1
4.5
pCi/L
Above EPA action level
Newton Center
Zone 1
4.5
pCi/L
Above EPA action level
Swampscott
Zone 1
4.5
pCi/L
Above EPA action level
Tyngsboro
Zone 1
4.5
pCi/L
Above EPA action level
Lexington
Zone 1
4.3
pCi/L
Above EPA action level
Tewksbury
Zone 1
4.3
pCi/L
Above EPA action level
Arlington
Zone 3
4.0
pCi/L
Below EPA action level
Winchester
Zone 3
4.0
pCi/L
Below EPA action level
Abington
Zone 3
4.0
pCi/L
Below EPA action level
Concord
Zone 3
4.0
pCi/L
Below EPA action level
Holliston
Zone 3
4.0
pCi/L
Below EPA action level
Kingston
Zone 3
4.0
pCi/L
Below EPA action level
Lynn
Zone 3
4.0
pCi/L
Below EPA action level
Needham Heights
Zone 3
4.0
pCi/L
Below EPA action level
Norfolk
Zone 3
4.0
pCi/L
Below EPA action level
Rockport
Zone 3
4.0
pCi/L
Below EPA action level
Wakefield
Zone 3
4.0
pCi/L
Below EPA action level
Waltham
Zone 3
4.0
pCi/L
Below EPA action level
Wellesley
Zone 3
4.0
pCi/L
Below EPA action level
West Newton
Zone 3
4.0
pCi/L
Below EPA action level
Danvers
Zone 3
3.8
pCi/L
Below EPA action level
Lowell
Zone 3
3.0
pCi/L
Below EPA action level
Marblehead
Zone 3
3.0
pCi/L
Below EPA action level
Newtonville
Zone 3
3.0
pCi/L
Below EPA action level
Shirley
Zone 3
1.0
pCi/L
Below EPA action level
Radon Mitigation Professionals Serving the Boston Metro Area
Licensed contractors who serve this metro area.
| Company | |
|---|---|
| A Rx for Radon | |
| Accustar Labs | |
| Ayotte Plumbing Heating & Air Conditioning | |
| Chapin Environmental Inc | |
| EBI Consulting | |
| Geological Field Services Inc | |
| Highland Home Inspections Inc | |
| Imperial Inspection Services Inc | |
| Institute for Environmental Education Inc | |
| Isothermics Company | |
| Mayflower Home Inspection | |
| MKC Associates | |
| Morgan K. Cohen Home Inspection LLC | |
| New England Radon Solutions | |
| Pro-Tech Consultants | |
| Radon 2Day | |
| Radon 4.0 | |
| Radon Detectives | |
| Radon Services Company | |
| SWAT Environmental | |
| Sweet Home Inspection Services LLC | |
| US Inspect LLC | |
| US Inspect LLC | |
| Whiting Environmental Building Inspection |
Frequently Asked Questions about Radon in the Boston Metro Area
Common questions about radon testing, mitigation costs, and health risks for homeowners in the Boston Metro metropolitan area.
Why are radon levels so high in the Boston Metro area?
Radon levels in the Boston Metro area are driven by the local soil and bedrock composition, which contains naturally occurring uranium. As uranium decays, it produces radon gas that migrates upward through the soil and enters homes through foundation cracks, sump pits, and gaps around pipes. Homes with basements and crawlspaces are especially susceptible because these below-grade spaces are in direct contact with the soil where radon concentrations are highest.
How much does radon mitigation cost in Boston Metro?
Professional radon mitigation in the Boston Metro metropolitan area typically costs between $800 and $2,500, depending on the size and construction of your home. The most common approach is an active sub-slab depressurization system, which a certified contractor can usually install in a single day. Ongoing energy costs for the mitigation fan are minimal—roughly $5–$10 per month—and most systems reduce radon levels by 90% or more.
Are landlords in Massachusetts required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some Massachusetts jurisdictions require landlords to disclose known radon levels or test results, while others have no mandate. Regardless of local law, the EPA recommends radon testing for all residential properties—including rentals—since radon is the second leading cause of lung cancer in the United States.
Can I sell a house with high radon levels in the Boston Metro area?
Yes. High radon levels do not prevent a home sale, but buyers in the Boston Metro market routinely request radon testing during the inspection period. If levels exceed 4.0 pCi/L, the buyer may negotiate for the seller to install a mitigation system before closing. Having a radon mitigation system already in place can actually be a selling point, demonstrating proactive home maintenance and providing documented proof of safe indoor air quality.